A professional since 1999, he has faced former world champions and contenders Nikolay Valuev, Odlanier Solis, Danny Williams, and Andrzej Wawrzyk.

Sidon turned professional in March 1999 in the Buergerzentrum Chorweiler, Cologne, Germany.

The crowd was very discontented with the ref's decision and beercups and bottles were thrown into the ring.

[1] Due to fighting without a referee (who left the ring in the third round), the EBU ruled the bout as a no-contest.

[2] Sidon became the World Boxing Union V. heavyweight Champion on May 26, 2012 by defeating Henadzi Daniliuk in the Stadthalle, Ransbach-Baumbach, Germany.